Answer this question truthfully
### Question: When to seek urgent medical care when I have Aphthous ulcer ?
### Response: Apply home treatment and call your health care provider if symptoms of canker sores persist or worsen, or canker sores recur more often than 2 or 3 times per year. If you have a mouth ulcer that lasts more that 2 weeks, you should see your doctor to rule out possible cancer. Call your health care provider if symptoms are associated with other problems such as fever, diarrhea, headache, or skin rash.